Small yellow circles mean rotations of order 2. Mirrors are represented by red lines and and glides by green ones. Yellow lines are the border of a fundamental region.
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dos romances
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*« -- Como* eu ia a dizer, o quartel de artilharia anti-aérea prantava-se
mesmo à beira do mar. Viam-se passar os navios, que iam para Lisboa. Às
vezes, ...
7 hours ago
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